Mogadishu vs national capital

Mogadishu and national capital both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mogadishu	Yes	No	No	No
national capital	Yes	No	No	No

Mogadishu (noun)	national capital (noun)
the capital and largest city of Somalia; a port on the Indian Ocean	the capital city of a nation